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How to create a mutable list in Java?

By IncludeHelp Last updated : February 4, 2024

Mutable lists refer to those lists which can be changed i.e., the modifiable lists are known as mutable lists in Java.

Problem statement

The task is to create a mutable list in Java.

Creating mutable list

To create a mutable list in Java, create an ArrayList by passing the immutable list created by the Arrays.asList() method.

Syntax

Below is the syntax to create a mutable list:

List<Integer> list=new ArrayList<>(Arrays.asList(elements));

Java program to create a mutable list

This program creates a mutable list.

// Importing the required classes
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

// Creating main class
public class Main {
  public static void main(String args[]) {

    // Creating a mutable list
    List < Integer > list = new ArrayList < > (
      Arrays.asList(10, 20, 30, 40, 50));

    // Printing the list 
    System.out.println("Mutable list is : " + list.toString());

    // Modifying the list by adding one more element
    list.add(60);

    // Printing the list 
    System.out.println("Modified list is : " + list.toString());
  }
}

Output

The output of the above program is:

Mutable list is : [10, 20, 30, 40, 50]
Modified list is : [10, 20, 30, 40, 50, 60]

To understand this program, you should have the basic knowledge of the following Java topics:

• Java System.out.println() Method
• Java Arrays
• Java Lists
• Java .toString() Method